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Overview of long-distance flow-slide caused by the 2018 Sulawesi earthquake, Indonesia
Kiyota T., Furuichi H.b, Hidayat R.F., Tada N.c, Nawir H.d
a Institute of Industrial Science, University of Tokyo, Tokyo, 153-8505, Japan
b Water Resources Department, International Division, Yachiyo Engineering Co., Ltd., Tokyo, 111-8648, Japan
c Disaster Risk Reduction Expert, Japan International Cooperation Agency Indonesia Office, Sentral Senayan II, Jakarta, 10270, Indonesia
d Department of Civil Engineering, Faculty of Civil and Environmental Engineering, Bandung Institute of Technology, Bandung, 40132, Indonesia
[vc_row][vc_column][vc_row_inner][vc_column_inner][vc_separator css=”.vc_custom_1624529070653{padding-top: 30px !important;padding-bottom: 30px !important;}”][/vc_column_inner][/vc_row_inner][vc_row_inner layout=”boxed”][vc_column_inner width=”3/4″ css=”.vc_custom_1624695412187{border-right-width: 1px !important;border-right-color: #dddddd !important;border-right-style: solid !important;border-radius: 1px !important;}”][vc_empty_space][megatron_heading title=”Abstract” size=”size-sm” text_align=”text-left”][vc_column_text]© 2020On 28th September 2018, an earthquake of Mw 7.5 struck Donggala Regency, Central Sulawesi, Indonesia, resulting in a catastrophic disaster and a large numbers of casualties. In this report, the results of the preliminary field investigations carried out by the authors’ team are summarized. The earthquake caused four major long-distance flow-slides on very gentle slopes of approximately 1–5% in and around Palu City: Balaroa, Petobo, Jono Oge and Sibalaya. The maximum flow distance at each site was several hundred meters or more. Spring waters were found in all affected areas even though there had not been a lot of rainfall before the survey. Interviews with local residents and witnesses of the flow-slide provided much evidence that the shallow groundwater in the affected areas had been pressurized before the earthquake. This confined groundwater is thought to have played an important role in the occurrence of long-distance flow-slide. In addition, the thickness of the flowed ground was found to be about 1.5 m by pit excavation survey in Jono Oge. Based on the results of the field survey and provided evidence, the likely fundamental mechanisms of the flow-slide are discussed.[/vc_column_text][vc_empty_space][vc_separator css=”.vc_custom_1624528584150{padding-top: 25px !important;padding-bottom: 25px !important;}”][vc_empty_space][megatron_heading title=”Author keywords” size=”size-sm” text_align=”text-left”][vc_column_text]Affected area,Field investigation,Field surveys,Fundamental mechanisms,Gentle slopes,Local residents,Pit excavation,Shallow groundwater[/vc_column_text][vc_empty_space][vc_separator css=”.vc_custom_1624528584150{padding-top: 25px !important;padding-bottom: 25px !important;}”][vc_empty_space][megatron_heading title=”Indexed keywords” size=”size-sm” text_align=”text-left”][vc_column_text]Confined groundwater,Damage survey,Long-distance flow-slide,Sulawesi earthquake[/vc_column_text][vc_empty_space][vc_separator css=”.vc_custom_1624528584150{padding-top: 25px !important;padding-bottom: 25px !important;}”][vc_empty_space][megatron_heading title=”Funding details” size=”size-sm” text_align=”text-left”][vc_column_text]The authors would like to express their sincere gratitude to the JICA Domestic Technical Support Committee members, in particular, Prof. Kenji Ishihara, Prof. Takaji Kokusho, Prof. Susumu Yasuda, Prof. Ikuo Towhata, Dr. Kimio Takeya, Prof. Mitsu Okamura and Prof. Hemanta Hazarika for their collaboration and help during the field investigation. This work was partly supported by JSPS KAKENHI Grant Number JP19KK0108 and grant funding of the JSCE committee of Promoting Innovation in Infrastructure Management.[/vc_column_text][vc_empty_space][vc_separator css=”.vc_custom_1624528584150{padding-top: 25px !important;padding-bottom: 25px !important;}”][vc_empty_space][megatron_heading title=”DOI” size=”size-sm” text_align=”text-left”][vc_column_text]https://doi.org/10.1016/j.sandf.2020.03.015[/vc_column_text][/vc_column_inner][vc_column_inner width=”1/4″][vc_column_text]Widget Plumx[/vc_column_text][/vc_column_inner][/vc_row_inner][/vc_column][/vc_row][vc_row][vc_column][vc_separator css=”.vc_custom_1624528584150{padding-top: 25px !important;padding-bottom: 25px !important;}”][/vc_column][/vc_row]